7月1日,北京召开第138场新型冠状病毒肺炎疫情防控工作新闻发布会,北京青年报记者从会上获悉,核酸检测结果有效期定在7天,是考虑潜伏期规律和可操作性。 据中
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- Ontario New Case+2,632
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